Setting Up Optical Service Channel Cards

This chapter describes the optical service channel (OSC) cards for Cisco ONS 15454 dense wavelengthdivisionmultiplexing (DWDM) networks. For card safety and compliance information, refer to the RegulatoryCompliance and Safety Information for Cisco ONS Platforms document.

An optical service channel (OSC) is a bidirectional channel connecting two adjacent nodes in a DWDMring. For every DWDM node (except terminal nodes), two different OSC terminations are present, one forthe west side and another for the east side. The channel transports OSC overhead that is used to manageDWDM networks. An OSC signal uses the 1510-nm wavelength and does not affect client traffic. Theprimary purpose of this channel is to carry clock synchronization and orderwire channel communicationsfor the DWDM network. It also provides transparent links between each node in the network. The OSC isan OC-3/STM-1 formatted signal.

There are two versions of the OSC modules: the OSCM, and the OSC-CSM, which contains the OSCwavelength combiner and separator component in addition to the OSC module.

The Mesh/Multiring Upgrade (MMU) card is used to optically bypass a given wavelength from one sectionof the network or ring to another one without requiring 3R regeneration.

On 15454-M2 and 15454-M6 shelves, the TNC and TNCE cards include the functions of the OSCM card.OSC can be created on the OC3 port (SFP-0) of the TNC and TNCE cards.

Note

The TNC and TNCE cards support two optical service channels (OSC): primary OSC and secondary OSC.

The primary optical service channel (SFP-0) supports the following interfaces:

• OC-3/STM-1

• Fast Ethernet (FE)

• Gigabit Ethernet (GE).

The secondary optical service channel (SFP-1) supports the following interfaces:

• Fast Ethernet (FE)

• Gigabit Ethernet (GE).

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Unless noted otherwise, the cards described in this chapter are supported on the CiscoONS 15454, Cisco ONS 15454 M6, Cisco ONS 15454 M2 platforms.

Note

Unless otherwise specified, “ONS 15454” refers to both ANSI and ETSI shelf assemblies.Note

• Card Compatibility, page 2

• Class 1 Laser Safety Labels, page 2

• OSCM Card, page 2

• OSC-CSM Card, page 4

Card CompatibilityTable 1: Software Release Compatibility for Optical Service Channel Cards in Cisco ONS 15454

R4.5 - R10.0Card Name

YesOSCM

YesOSC-CSM

Class 1 Laser Safety LabelsFor information about safety labels, see the "Safety Labels" section.

OSCM Card(Cisco ONS 15454 only)

For OSCM card specifications, see the OSCM Card Specifications document.Note

On 15454-M2 and 15454-M6 shelves, the TNC and TNCE cards include the functions of the OSCM card.Note

The OSCM card is used in amplified nodes that include the OPT-BST, OPT-BST-E, or OPT-BST-L boosteramplifier. The OPT-BST, OPT-BST-E, and OPT-BST-L cards include the required OSCwavelength combiner

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and separator component. The OSCM cannot be used in nodes where you use OC-N/STM-N cards, electricalcards, or cross-connect cards. The OSCM uses Slots 8 and 10, which are also cross-connect card slots.

The OSCM supports the following features:

• OC-3/STM-1 formatted OSC

• Supervisory data channel (SDC) forwarded to the TCC2/TCC2P/TCC3 cards for processing

• Distribution of the synchronous clock to all nodes in the ring

• 100BaseT far-end (FE) User Channel (UC)

• Monitoring functions such as orderwire support and optical safety

The OC-3/STM-1 section data communications channel (SDCC or RS-DCC) overhead bytes are used fornetwork communications. An optical transceiver terminates the OC-3/STM-1, then it is regenerated andconverted into an electrical signal. The SDCC or RS-DCC bytes are forwarded to the active and standbyTCC2/TCC2P/TCC3 cards for processing through the system communication link (SCL) bus on the backplane.Orderwire bytes (E1, E2, F1) are also forwarded via the SCL bus to the TCC2/TCC2P/TCC3 for forwardingto the AIC-I card.

The payload portion of the OC-3/STM-1 is used to carry the fast Ethernet UC. The frame is sent to apacket-over-SONET/SDH (POS) processing block that extracts the Ethernet packets andmakes them availableat the RJ-45 connector.

The OSCM distributes the reference clock information by removing it from the incoming OC-3/STM-1 signaland then sending it to the DWDM cards. The DWDM cards then forward the clock information to the activeand standby TCC2/TCC2P/TCC3 cards.

For more information about the OSCM card, see http://www.cisco.com/en/US/prod/collateral/optical/ps5724/ps2006/product_data_sheet09186a00801a1641.html.

OSCM Card FunctionsThe functions of the OSCM card are:

• OSCM Card Power Monitoring

• See "Card level indicators"

• See "Port-Level Indicators"

OSCM Card Power MonitoringPhysical photodiode P1 monitors the power for the OSCM card. The returned power level value is calibratedto the OSC TX port.

Table 2: OSCM VOA Port Calibration

Calibrated to PortCTC Type NamePhotodiode

OSC TXOutput OSCP1

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For information on the associated TL1 AIDs for the optical power monitoring points, refer the “CTC PortNumbers and TL1 Aids” section in Cisco ONS SONET TL1 Command Guide.

Related Procedures for the OSCM CardThe following is the list of procedures and tasks related to the configuration of the OSCM card:

OSC-CSM Card

For OSC-CSM card specifications, see the OSC-CSM Card Specifications document.Note

The OSC-CSM card is used in unamplified nodes. This means that the booster amplifier with the OSCwavelength combiner and separator is not required for OSC-CSM operation. The OSC-CSM can be installedin Slots 1 to 6 and 12 to 17. To operate in hybrid mode, the OSC-CSM cards must be accompanied bycross-connect cards. The cross-connect cards enable functionality on the OC-N/STM-N cards and electricalcards.

The OSC-CSM supports the following features:

• Optical combiner and separator module for multiplexing and demultiplexing the optical service channelto or from the wavelength division multiplexing (WDM) signal

• OC-3/STM-1 formatted OSC

• SDC forwarded to the TCC2/TCC2P/TCC3 cards for processing

• Distribution of the synchronous clock to all nodes in the ring

• 100BaseT FE UC

• Monitoring functions such as orderwire support

• Optical safety: Signal loss detection and alarming, fast transmitted power shut down by means of anoptical 1x1 switch

• Optical safety remote interlock (OSRI), a feature capable of shutting down the optical output power

• Automatic laser shutdown (ALS), a safety mechanism used in the event of a fiber cut. For details onALS provisioning for the card, see the . For information on using the card to implement ALS in a network,see the .

The WDM signal coming from the line is passed through the OSC combiner and separator, where the OSCsignal is extracted from the WDM signal. The WDM signal is sent along with the remaining channels to theCOM port (label on the front panel) for routing to the OADM or amplifier units, while the OSC signal is sentto an optical transceiver.

The OSC is an OC-3/STM-1 formatted signal. The OC-3/STM-1 SDCC or RS-DCC overhead bytes are usedfor network communications. An optical transceiver terminates the OC-3/STM-1, and then it is regeneratedand converted into an electrical signal. The SDCC or RS-DCC bytes are forwarded to the active and standbyTCC2/TCC2P/TCC3 cards for processing via the SCL bus on the backplane. Orderwire bytes (E1, E2, F1)are also forwarded via the SCL bus to the TCC2/TCC2P/TCC3 for forwarding to the AIC-I card.

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The payload portion of the OC-3/STM-1 is used to carry the fast Ethernet UC. The frame is sent to a POSprocessing block that extracts the Ethernet packets andmakes them available at the RJ-45 front panel connector.

The OSC-CSM distributes the reference clock information by removing it from the incoming OC-3/STM-1signal and then sending it to the active and standby TCC2/TCC2P/TCC3 cards. The clock distribution isdifferent from the OSCM card because the OSC-CSM does not use Slot 8 or 10 (cross-connect card slots).

S1 and S2 (Figure 4-5 on page 4-10) are optical splitters with a splitter ratio of 2:98. The result is that thepower at the MON TX port is about 17 dB lower than the relevant power at the COM RX port, and thepower at the MON RX port is about 20 dB lower than the power at the COM TX port. The difference isdue to the presence of a tap coupler for the P1 photodiode.

Note

For more information about the OSCM card, see http://www.cisco.com/en/US/prod/collateral/optical/ps5724/ps2006/product_data_sheet09186a00801a1641.html.

OSC-CSM Card FunctionsThe functions of the OSC-CSM card are:

• OSC-CSM Card Power Monitoring

• See "Alarms and thresholds"

• See "Card level indicators"

• See "Port-Level Indicators"

OSC-CSM Card Power MonitoringPhysical photodiodes P1, P2, P3, and P5 monitor the power for the OSC-CSM card. Their function is asfollows:

• P1: The returned power value is calibrated to the LINE RX port, including the insertion loss of theprevious filter (the reading of this power dynamic range has been brought backward towards the LINERX output).

• P2: The returned value is calibrated to the LINE RX port.

• P3: The returned value is calibrated to the COM RX port.

• P5: The returned value is calibrated to the OSC TX port, including the insertion loss of the subsequentfilter.

The returned power level values are calibrated to the ports as shown in the following table.

Table 3: OSC-CSM Port Calibration

PM ParametersPowerCalibrated to PortCTC Type NamePhotodiode

SupportedChannel PowerLINE RXInput LineP1

OSC Power

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PM ParametersPowerCalibrated to PortCTC Type NamePhotodiode

SupportedOSC PowerLINE RXInput LineP2

SupportedChannel PowerCOM RXInput ComP3

SupportedOSC PowerOSC TXOutput OSCP5

The OSC power on the LINE TX is the same as the power reported from P5.

The PM parameters for the power values are listed at Optics and 8b10b PM Parameter Definitions.

For information on the associated TL1 AIDs for the optical power monitoring points, refer the “CTC PortNumbers and TL1 Aids” section in Cisco ONS SONET TL1 Command Guide.

Related Procedures for the OSC-CSM CardThe following is the list of procedures and tasks related to the configuration of the OSC-CSM card:

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